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MAX4070AUA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4070AUA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page External Reference (MAX4072) The MAX4072 contains REFIN pin for external refer- ence voltage. The allowable voltage range on REFIN is 1V (min) to 4V (max) with VCC ≥ 5.1V. Reference Output (MAX4069/MAX4060/MAX4071) The REFOUT of the MAX4069/MAX4070/MAX4071 can sink 100µA and source 500µA. Keep the total capaci- tance on REFOUT under 500pF to maintain stability. Recommended Component Values Ideally, the maximum load current develops the full- scale sense voltage across the current-sense resistor. Choose the gain needed to yield the maximum output voltage required for the application: VOUT = VSENSE x AV where VSENSE is the full-scale sense voltage, 75mV for gain of 50V/V, or 50mV for gain of 100V/V. AV is the gain of the device. In applications monitoring high current, ensure that RSENSE is able to dissipate its own I2R loss. If the resis- tor’s power dissipation is exceeded, its value may drift or it may fail altogether, causing a differential voltage across the terminals in excess of the absolute maxi- mum ratings. Use resistors specified for current- sens- ing applications. The MAX4069–MAX4072 sense a wide variety of cur- rents with different sense-resistor values. Table 1 lists common resistor values for typical operation of these devices. Listed output voltage is with respect to REF. Sense Resistor, RSENSE Choose RSENSE based on the following criteria: Voltage Loss: A high RSENSE value causes the power- source voltage to degrade through IR loss. For minimal voltage loss, use the lowest RSENSE value. Accuracy: A high RSENSE value allows lower currents to be measured more accurately. This is because off- sets become less significant when the sense voltage is larger. For best performance, select RSENSE to provide approximately 75mV (gain of 50V/V) or 50mV (gain of 100V/V) of sense voltage for the full-scale current in each application. Efficiency and Power Dissipation: At high-current lev- els, the I2R losses in RSENSE can be significant. Take this into consideration when choosing the resistor value and its power dissipation (wattage) rating. Also, the sense resistor’s value might drift if it is allowed to heat up excessively. Inductance: Keep inductance low if ISENSE has a large high-frequency component. Wire-wound resistors have the highest inductance, while metal film is somewhat better. Low-inductance metal-film resistors are also available. Instead of being spiral-wrapped round a Bidirectional, High-Side, Current-Sense Amplifiers with Reference ______________________________________________________________________________________ 11 MAX4070 IDISCHARGE RSENSE ICHARGE LOAD TO ADC 2.5V VCC GSEL GND RS- RS+ REFOUT OUT SHDN 2 CELLS -25mV 25mV 50mV 0 DISCHARGE CURRENT CHARGE CURRENT -2.5V 5V 2.5V AV = 100 VOUT - VREF VSENSE Figure 2. Bidirectional Current Monitor |
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